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FATTY SUBSTANCES  (GENERAL METHODS)           387

more general case, of stearic and palmitic acids, the respective proportions
of these two acids may be determined from either the acid number or the
melting point of the mixture.

The following table of Mangold and Marazza gives the proportions of
steanc and palmitic acids in a mixture of the two acids, on the basis of the
acid number.

TABLE  XLII
Stearic and Palmitic Acids from the Acid Number

Acid Number (mgrms.   of KOH per gram of mixture).
	100 parts of mixture contain
		Acid Number     ; (mgrms. of       ; KOH per gram     I of mixture).      !
	ioo parts of mixture contain
	
	Stearic    j     Palmitic Acid.              Acid.
			Stearic Acid.
	!    Palmitic \        Acid.

197-50
	100         ;        
		208-86          ;
	4-T
	!

198-50                  95        '          5
			209-95      ;
	40
	i         D ) 60

I99-50                  9                  10
			211-06         !
	35
	65

200-50         ,        85
		15
	212-18     ;
	3
	70

201-50
	80
	20
	213-30      !
	25
	75

202-50
	75
	25
	214-45      !
	20
	so

203-50
	70
	30
	215-60
	t-5
	85

204-60
	65
	35
	216-77      i
	10
	90

205-60
	60
	40
	217-95
	5
	95

206-70
	55                 45
		219-13
	o
	IOO

207-77
	50
	5
	
	
	

The following table gives the stearic and palmitic acids contained in a
mixture of these two acids in relation to the melting point of the mixture,
according to Heintz and according to Hehner.

TABLE XLIII
Palmitic and Stearic Acids from the Melting Point

Melting Point.
		
	
	


		Solidifying
	Palmitic Acid.
	Steajic Acid.


		Point.
	o/ /o
	

Heintz.
	Hehner.
	
	
	

62-0
	6l-8
	
	IOO
	o

60-1
	59-0
	54-5
	90
	10

57-5
	56-5
	53-8
	80
	20

55-1
	54-2
	54'
	70
	3

56-3
	55-5
	54-5
	60
	40

56-6
	55-6
	55'
	50
	50

60-3
	59'4
	56-5
	40
	60

62-9
	61-5
	59-3
	30
	70

65-3
	64-2
	60-3
	20
	So

67-2
	66-5
	62-5
	IO
	90

69-2
	68-5
	~
	-
	IOO

acids, if solid, or 5 grams if liquid, are